RIRS (retrograde intrarenal surgery) is a minimally invasive procedure used to reach and treat stones inside the kidney. The surgeon passes a thin, flexible instrument called a ureteroscope through the natural urinary passage, usually entering through the urethra and bladder before advancing into the ureter and kidney.

A laser is then used to fragment the stone into smaller pieces or fine particles. This technique is known as RIRS laser lithotripsy. It does not generally require an incision through the skin to reach the kidney.

RIRS is one of several procedures available for kidney stone removal. Its suitability depends on stone size, location, anatomy, infection status, kidney function and the patient's overall health. Current European Association of Urology guidance recognizes flexible ureteroscopy and laser lithotripsy as established options for appropriately selected urinary stones.

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides kidney evaluation and management. When a stone-removal procedure is required, the appropriate urological specialist can assess the procedural options.

How Does RIRS Remove a Kidney Stone?

RIRS allows the treating surgeon to reach stones in different parts of the kidney without creating a direct surgical opening through the skin.

The procedure generally involves these steps:

1. Anesthesia: RIRS is usually performed under general anesthesia, depending on the clinical plan.

2. Scope insertion: A flexible ureteroscope is passed through the urethra and bladder into the ureter.

3. Kidney access: The scope is advanced into the kidney to locate the stone.

4. Laser fragmentation: A laser fiber breaks the stone into smaller fragments or dust.

5. Fragment management: Depending on the stone and procedure, fragments may be removed using a small basket or left as fine particles to pass in the urine.

6. Stent placement, if needed: A temporary ureteral stent may be inserted to support urine drainage and recovery.

The exact technique varies according to the stone's characteristics and the surgeon's assessment. Holmium:YAG and thulium fiber lasers are among the laser systems used for flexible ureteroscopy.

Which Kidney Stones Can Be Treated With RIRS?

RIRS may be considered for kidney stones when treatment is indicated and the stone can be reached safely with a flexible ureteroscope.

It may be suitable for:

• Stones in the renal pelvis

• Stones in the upper, middle or lower kidney calyces

• Selected stones that are difficult to treat with shock wave lithotripsy

• Certain stones in patients for whom a percutaneous procedure is less suitable

• Selected residual stones after previous treatment

Not every stone should be treated with RIRS. Very large or complex stones may be better managed with percutaneous nephrolithotomy (PCNL), while some smaller stones can be observed or treated with other methods.

For kidney stones larger than 2 cm, PCNL is generally the preferred first-line procedure when active removal is required. Flexible ureteroscopy may still be considered in selected circumstances, but additional sessions may be needed.

When Is RIRS Laser Surgery Recommended?

A kidney stone does not always need immediate removal. Some small, uncomplicated stones can be monitored, depending on their size, location, symptoms and the patient's clinical condition.

A specialist may consider active treatment when a stone:

• Causes persistent or recurrent pain

• Grows during follow-up

• Produces urinary obstruction

• Is associated with recurrent infection

• Has a low likelihood of passing naturally

• Creates a particular risk because of the patient's medical circumstances

RIRS may be selected after reviewing imaging, kidney function, stone characteristics and the expected benefits and risks of available treatments.

Important: A urinary obstruction accompanied by infection can be an emergency. Urgent drainage with a ureteral stent or nephrostomy may be necessary before definitive stone removal.

What Tests Are Needed Before RIRS?

Before deciding on RIRS, the treating team needs to understand the stone's location, size and potential effect on the urinary tract.

Imaging

A CT scan or ultrasound may be used to assess the stone and look for obstruction. A non-contrast CT scan often provides detailed information about stone size, number, location and density.

Urine Testing

Urinalysis and, when indicated, a urine culture help identify infection or other urinary abnormalities. An active infection may need treatment before a planned stone-removal procedure.

Blood Tests

Depending on the patient's condition, testing may include:

• Serum creatinine and eGFR

• Electrolytes

• Blood count

• Other tests required for anesthesia or procedural planning

Medication and Medical History Review

The team should know about blood thinners, allergies, previous stone procedures, existing stents, kidney disease and other medical conditions.

These assessments help the treating specialist decide whether RIRS is appropriate or whether another approach would be safer.

RIRS vs ESWL vs PCNL: What Is the Difference?

The procedures differ in how they reach and remove the stone.

No procedure is best for every patient. Stone size, location, density, anatomy, infection risk, medical history and patient preference all influence the decision.

Is RIRS Laser Lithotripsy Painful?

During RIRS, anesthesia is used to prevent pain from the procedure itself. Afterward, some patients experience temporary discomfort.

Possible symptoms include:

• Burning during urination

• Mild blood in the urine

• Frequent urination

• Urinary urgency

• Flank discomfort

• Bladder irritation, especially if a stent is present

The intensity and duration of symptoms vary. The treating team can recommend appropriate pain relief based on kidney function, medical history and other medicines.

Severe or worsening pain, fever, chills or difficulty passing urine should not be dismissed as routine recovery symptoms.

How Long Does Recovery After RIRS Take?

Recovery depends on the stone burden, procedure duration, whether a stent was inserted, and the patient's overall health.

Many patients return to routine activities within a few days, but recovery may take longer after a complex or staged procedure.

After RIRS, the treating team may advise patients to:

• Take prescribed medicines as directed

• Follow individualized fluid instructions

• Avoid strenuous activity for the period recommended

• Monitor urine output and symptoms

• Attend the scheduled follow-up

• Complete recommended imaging or urine tests

• Return for stent removal when planned

There is no single recovery timeline that applies to every patient.

Why Might a Ureteral Stent Be Required After RIRS?

A ureteral stent is a thin tube placed between the kidney and bladder to help urine drain.

It may be used after RIRS when the ureter is swollen, fragments may obstruct urine flow, or the treating surgeon considers temporary drainage support beneficial.

A stent can cause temporary symptoms, including:

• Frequent urination

• Urgency

• Burning

• Bladder discomfort

• Flank pain during urination

• Blood in the urine

A stent is not always required after an uncomplicated ureteroscopy. The decision depends on the procedure and the patient's individual risks.

If a stent is inserted, confirm the planned removal or exchange date. Do not leave a temporary stent in place longer than instructed.

What Are the Possible Risks of RIRS?

RIRS is minimally invasive, but complications can still occur.

Potential risks include:

• Urinary tract infection

• Fever or, rarely, a serious infection

• Bleeding in the urine

• Injury or irritation of the ureter

• Temporary blockage from fragments

• Residual stone material

• Stent-related discomfort

• Need for another procedure

• Anesthesia-related complications

The risk depends on the patient's health, stone characteristics, infection status and procedural complexity.

The treating specialist should explain the expected benefits, alternatives and relevant risks before obtaining consent.

Can RIRS Remove a Large Kidney Stone in One Session?

Sometimes, but not always.

A larger stone burden may take longer to fragment and clear. Depending on the stone's size, location and density, the surgeon may recommend more than one session or a different procedure.

For stones larger than 2 cm, PCNL is generally the preferred initial approach when active treatment is required. RIRS may be considered if PCNL is unsuitable or in other selected circumstances, with an increased possibility of further treatment.

The goal is safe and effective stone clearance, not simply completing treatment in one session.

Can Kidney Stones Return After RIRS?

Yes. RIRS treats existing stones, but it does not necessarily remove the factors that caused them to form.

Prevention depends on the stone's composition and the patient's medical history. A clinician may recommend:

• Stone analysis when material is available

• Blood and urine tests for metabolic risk factors

• Individualized fluid guidance

• Reducing excessive dietary sodium

• Appropriate dietary calcium rather than unnecessary restriction

• Treatment of specific metabolic abnormalities

• Preventive medicines for selected patients

• Follow-up imaging when indicated

People with recurrent stones may benefit from a more detailed metabolic evaluation.

Is RIRS Suitable for People With Reduced Kidney Function?

Reduced kidney function does not automatically rule out RIRS, but it makes individualized assessment particularly important.

The treating team may need to consider:

• Current creatinine and eGFR

• Whether one or both kidneys are affected

• Presence of obstruction

• Infection status

• Electrolyte abnormalities

• Other illnesses and medications

• The potential effect of delaying stone removal

A stone that obstructs urine drainage may threaten kidney function, especially if obstruction is prolonged or infection is present. The treatment plan should balance the urgency of stone management with the patient's overall medical condition.

When Should You Seek Urgent Care After RIRS?

Contact the treating team promptly or seek urgent medical attention if you develop:

• Fever or chills

• Severe or worsening flank pain

• Persistent vomiting

• Very little or no urine

• Difficulty passing urine

• Heavy bleeding or large clots in the urine

• Severe weakness or confusion

• Breathlessness or sudden deterioration

These symptoms may indicate infection, obstruction or another complication that requires prompt assessment.

Kidney Stone Evaluation at Prabhakar Bhurke Clinic

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides kidney evaluation and management for patients with kidney stones and associated kidney-function concerns.

Depending on the patient's needs, assessment may include:

• Review of creatinine and eGFR

• Evaluation of urinary obstruction

• Review of CT or ultrasound reports

• Assessment of infection and urine findings

• Evaluation of recurrent stone risk

• Management of associated kidney disease

• Coordination with a urologist for RIRS or another stone-removal procedure when appropriate

• Follow-up of kidney function after treatment

RIRS is a procedural treatment generally performed by a trained urologist. The appropriate treatment pathway depends on the stone's features, kidney function and the patient's overall health.

Frequently Asked Questions

What is RIRS laser lithotripsy?

RIRS is a minimally invasive kidney stone procedure in which a flexible ureteroscope is passed through the urinary tract into the kidney. A laser breaks the stone into smaller fragments or fine particles.

Is RIRS surgery without an incision?

RIRS usually does not require an external skin incision because the scope reaches the kidney through the natural urinary passage.

Is RIRS better than ESWL?

Not in every case. RIRS allows direct visualization and laser fragmentation, while ESWL uses external shock waves. The better option depends on the stone's size, location, density and other clinical factors.

Is RIRS better than PCNL?

RIRS may be suitable for selected stones, while PCNL is generally preferred for larger kidney stones, particularly those over 2 cm when removal is needed. The choice depends on individual circumstances.

How long does RIRS laser lithotripsy take?

The duration varies with stone size, number, location and procedural complexity. The treating urologist can provide an estimate after reviewing the imaging.

Is a stent always necessary after RIRS?

No. A stent may be placed when temporary drainage support is needed, but it is not required in every uncomplicated case.

Can RIRS permanently prevent kidney stones?

No. RIRS removes or fragments existing stones but does not guarantee that new stones will not form. Prevention and follow-up depend on the cause of stone formation.

When can I return to work after RIRS?

Some patients resume routine activities within a few days, while others need more time. Follow the discharge instructions and seek advice if symptoms persist or worsen.

Conclusion

RIRS laser lithotripsy is a minimally invasive option for removing selected kidney stones using a flexible ureteroscope and laser energy. It can treat stones in different parts of the kidney without the usual external incision required for a percutaneous approach.

However, the procedure is not suitable for every stone. Size, location, density, urinary anatomy, infection status and kidney function all influence whether RIRS, ESWL, PCNL or another approach is appropriate.

Before deciding on treatment, review the imaging and kidney-function results with the relevant specialists. After the procedure, follow the medication, recovery and stent-removal instructions carefully, and seek urgent care for fever, severe pain or markedly reduced urine output.

For kidney-function evaluation and coordinated kidney stone care, consult Dr. Sandip Prabhakar Bhurke at Prabhakar Bhurke Clinic.

Medical Disclaimer

This article is intended for general educational and informational purposes only and is not a substitute for professional medical advice, diagnosis or treatment. RIRS laser lithotripsy may not be appropriate for every kidney stone, and treatment selection must be based on stone characteristics, imaging, kidney function, infection status and the patient's overall health. RIRS is generally performed by a trained urologist. Do not start or change medicines or delay treatment for an obstructed or infected urinary tract based on this article. Fever or chills with suspected obstruction, severe pain, persistent vomiting, very little or no urine, heavy bleeding or sudden deterioration requires prompt medical assessment. Consult a qualified urologist and nephrologist, as appropriate, for an individualized treatment plan.